As I've mentioned probably one too many times....
Superclubs tried to sue me in federal court in 1998 when the 1st edition of the Hedo II book came out in an effort to stop distribution.
They didn't get beyond a hearing stage b/c the judge recommended that SC negotiate with me since the judge "wasn't in the business of banning books." Still cost me $8,000+ in legal fees to defend myself. Glad that's well in the past and book sales eventually covered that cost.
Posts to Trip Advisor are similar: fair comment and criticism is allowed. False statements are a different category of law.